Difference between ABS E and ABS D steel plate

ABS E and ABS D are categories of hull structural steel plates certified by the American Bureau of Shipping (ABS), differentiated primarily by their specified low-temperature toughness. These grades are fundamental in shipbuilding for ensuring structural integrity in various operating environments. The key distinction between them lies in the minimum temperature at which their impact toughness (Charpy V-notch test) is guaranteed.

Key Differences

The primary difference is the impact test temperature requirement, which dictates their service applications. ABS D Grade steel is required to provide adequate impact energy at 0°F (-18°C). This makes it suitable for vessels operating in cold, but not Arctic, waters, such as the North Atlantic. In contrast, ABS E Grade steel must meet impact toughness requirements at the significantly lower temperature of -40°F (-40°C). This superior low-temperature performance qualifies it for use in ice-going vessels, Arctic supply ships, and structures subjected to polar conditions. To achieve this, E grade steel involves stricter chemical composition control (e.g., finer grain practice) during manufacturing. Therefore, the selection criterion is clear: ABS D is for general oceangoing service in cold climates, while ABS E is mandatory for operations in severe Arctic or Antarctic environments where the risk of brittle fracture is critically high.

Chemical Composition

Mechanical Property